Electromagnetic waves

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Question 23
Easy

A student investigates the refraction of a ray of light passing from air into a rectangular perspex block. They measure the angle of incidence, iii, and the angle of refraction, rrr, for several different angles.

Their plotted results are shown on the graph below:

A graph plotting the angle of refraction, r, in degrees on the vertical y-axis, against the angle of incidence, i, in degrees on the horizontal x-axis. The vertical axis goes from 0 to 50 degrees with major grid lines every 10 degrees. The horizontal axis goes from 0 to 90 degrees with major grid lines every 10 degrees. A smooth curve of best fit starts at the origin (0,0) and bends downwards, passing through points near (20, 13), (40, 25), (60, 36), and (80, 42).

How does the graph show that the angle of refraction inside the block is not directly proportional to the angle of incidence?

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Electromagnetic waves Questions

  1. GCSE
  2. /Physics
  3. /Electromagnetic waves